"Frankie D." <FrankieD@discussions.microsoft.com> wrote in message
news:82010327-0434-4CCA-93B7-6CA020D878E4@microsoft.com...
> Hi,
>
> I have a "document". My doc can be divided to thousends of lines. Every
> line
> can be displayed as a drawing, every line has an OnPaint method. How can
> be
> displayed this document??? The height of every line is 75.
>
> If each line is reperesented by separate controls the program will be very
> slow, because thousands of controls must be checked every time wether they
> are on the screen or not (?).
>
> If the whole document is reperesented by one control size limitation seems
> to be exceeded: the height of my "one and only" control should be more
> than
> 75000. System.Windows.Forms can not be resized (or not always can be
> resized)
> to this height. The limit is 32767. ( My very large control is on a Panel
> in
> this case.
>
> I don't know the general way to handle large docs. Please help!!!
>
> Frankie
>
>

"Paul G. Tobey [eMVP]" wrote:

> The basic answer is 1) that's a bad design of the UI and 2) since you have a
> large amount of data, you're not going to be able to have a single panel or
> something that will actually contain everything. You'll have to build what
> I might call a virtual panel, attach a scroll bar and, based on the scroll
> bar position you, yourself, will have to decide what pieces your control
> "contains" (not really, but virtually), to draw, calling then appropriately.
> That is, *you* take over from the window manager to figure out what's
> visible and to call those items and tell them where in the unscrolled area
> of your virtual panel to draw (nothing is ever scrolled; the scroll bar just
> tells you where you should look for the items to be drawn).
>
> Don't underestimate the advantages of actually rethinking your design, but
> it is certainly possible to do 2.
>
> Paul T.
>
> "Frankie D." <FrankieD@discussions.microsoft.com> wrote in message
> news:82010327-0434-4CCA-93B7-6CA020D878E4@microsoft.com...
> > Hi,
> >
> > I have a "document". My doc can be divided to thousends of lines. Every
> > line
> > can be displayed as a drawing, every line has an OnPaint method. How can
> > be
> > displayed this document??? The height of every line is 75.
> >
> > If each line is reperesented by separate controls the program will be very
> > slow, because thousands of controls must be checked every time wether they
> > are on the screen or not (?).
> >
> > If the whole document is reperesented by one control size limitation seems
> > to be exceeded: the height of my "one and only" control should be more
> > than
> > 75000. System.Windows.Forms can not be resized (or not always can be
> > resized)
> > to this height. The limit is 32767. ( My very large control is on a Panel
> > in
> > this case.
> >
> > I don't know the general way to handle large docs. Please help!!!
> >
> > Frankie
> >
> >
>
>